Brake disk assembly



C. L. EKSERGIAN Sept. 2, 1941,.

BRAKE DI SK ASSEMBLY Filed May 51 1959 I N VEN TOR ryzan/ ATTORNEY Patented Sept. 2,

BRAKE DISK ASSEMBLY Carolus L. Ekserginn, Detroit, Mich., assignor to Budd Wheel Company. Philadelphia, Pa., a corporation of Pennsylvania Application May 31, 1939, Serial No. 276,580

The present invention relates to a further development of the type of brake disclosed in copending application Serial Number 159,844, flied August 19, 1937, now Patent No. 2,214,762 granted Sept. 17, 1940.

These brakes include rings which cooperate with lateral brake shoes acting against the sides or plane faces thereof, in contrast to the type of brake heretofore common wherein a cylindrical peripheral surface is the active friction surface that receives the brake shoes.

A preferred copending former embodiment of this lateral type of brake employs two rings which are spaced apart, with airblast producing vanes located therebetween, and with braces or ribs rigidly connecting the rings, these usually being made as separate kinds of elements, the ribs being relatively thick and the vanes rather thin. The present invention does away with this difference and provides a single style of heavy rib which serves both purposes.

A clearer understanding of the invention will be had from the present specification and the drawing accompanying the same, disclosing several illustrative forms of the device.-

In said drawing:

8, and may thence increase in thickness toward the central hole 2, thus providing shear-resisting sectional areas proportioned to the respective moments they must resist. -In this way, the

material of the web is used to the best mechanisists of the two approximately similar rings 5 I and 6 joined by a number of generally radially 'extending ribs or braces 8. As shown best in Fig. 3, these ribs or braces are provided with generously designed or wide fillets l0, so that they merge very gradually into the rings. The

Fig. 1 is an elevation of a brake disk embodying the invention, applied to a car wheel, parts being shown in section;

Fig. 2 is a fragmentary section of the structure disclosed in Fig. 1, on the plane indicated by the line 2-2;

Fig, 3 is a developed view of a fragment of a still further modidisk is shown as having a supporting web I with a fiange 2 defining its central edge and forming a hole to make it possible to apply the disk to a wheel and/or axle. A number of holes 8 may be provided in the web I to receive the securing bolts 3a, as indicated, for bolting it to the hub of a wheel. The web I may also have its outer portion offset, as shown at l, to bring the rings 5 and 8 out of the plane of the middle portion I of the said web.

Preferably a series of keys or lugs, here shown as dovetails 8, is provided at the outermost edge of the web I, to provide a secure connection with the ring 5 when the ring structure is applied to the web as by casting. The web may have a relatively thinperlpheral portion, near the keys braces or ribs 9 are spaced relatively close together as compared with the spacing of the rings;

This provides a very good mechanical constructlon, that is, it is very strong and rigid, and at the same time it provides also a good heat conduction between the ribs 9 and the rings 5 and 8.

The air passages il, defined between the adjacent ribs or braces 9, are seen to be large and unobstructed, thus affording free passage to large volumes of cooling air, which are caused to flow by the ribs or braces ,9, acting as the pro:

pelier blades of a centrifugal blower, when'the structure is in rotation while in service. Adequate cooling is thus produced by a very rugged and simple structure, which may readily be cast in a single operation.

Referring now to Fig. 4, the rings 5 and 6 are here shown as connected by ribs or braces I 2 which instead of being bounded by the substantially elliptic or circular arcs of Fig. 3, are corrugated to increase the exposed surfaces l3, and thereby also the cooling efiect. The passages are therefore of corrugated outline instead of being oval or elliptic, but nevertheless they are of ample area to conduct the cooling air without undue resistance, so that on the whole the cooling eifect is increased, without decreasing the mechanicaljstrength or rigidity of the structure.

In order to maintain the ribs of substantially uniform thickness in spite of the corrugations, the form shown in Fig. 5 may be utilized. Here the ribs I! are. bounded by wavy curves l6 so shaped that a convexity on one side of the rib is opposite a corresponding concavity on the other side, so that the thickness dimension t of the ribs remains substantially uniform throughbut the ribs I! are made more nearly uniform in strength.

Having thus described a preferred embodi-' ment of the invention and several modifications thereof,- it will be understood that the present specification and drawing are to be taken solely in an illustrative sense, and not in any way as a limitation of the invention, which is defined solely in the following claims.

What I claim is: a 1. A brake disk comprising a pair of spaced rings, each having a radial braking face, said rings being interconnected by integral circumferentially spaced radially extending braces forces applied to the radial braking faces, the

while providing with said rings radial cooling ducts between the braces which act as a centrifugal blower to cause flow of cooling air.

through said ducts, the rings being relatively thin as compared with the width of said cooling ducts.

2. A brake disk according to claim 1, in which the rings and braces are a unitary casting. and

the spacing of the rings, the contour of the braces and their spacing from each other is such as to provide generally oval cross-section ducts axis at right angles to the rings. the cross-sectional area of the ducts being greater than the cross-sectional area .of the braces.

3. A brake disk according to claim 1 in which the braces are of substantially uniform thickness through most of their length and have corrugated side faces, a concave portionon one side being opposite a convex portion on the other side.

4. A brake disk according to claim 1, in which the rings and braces area unitary casting secured to a member to be braked solely by a web support secured to one only of said rings.

' CAROLUS L. EKSERGIAN. 

